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| author | Thomas Munro <tmunro@postgresql.org> | 2018-09-20 14:03:05 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2018-09-20 14:21:44 +1200 |
| commit | 98a4e814e473784716f889d8e67d66c38e94c6b0 (patch) | |
| tree | 57dee617fbb6bd816a8cec5df3d16500db9edd03 /src/backend/executor | |
| parent | 82b7cfaaadb46f50bfa23759d2e6ce3a343e932e (diff) | |
Defer restoration of libraries in parallel workers.
Several users of extensions complained of crashes in parallel workers
that turned out to be due to syscache access from their _PG_init()
functions. Reorder the initialization of parallel workers so that
libraries are restored after the caches are initialized, and inside a
transaction.
This was reported in bug #15350 and elsewhere. We don't consider it
to be a bug: extensions shouldn't do that, because then they can't be
used in shared_preload_libraries. However, it's a fairly obscure
hazard and these extensions worked in practice before parallel query
came along. So let's make it work. Later commits might add a warning
message and eventually an error.
Back-patch to 9.6, where parallel query landed.
Author: Thomas Munro
Reviewed-by: Amit Kapila
Reported-by: Kieran McCusker, Jimmy
Discussion: https://postgr.es/m/153512195228.1489.8545997741965926448%40wrigleys.postgresql.org
Diffstat (limited to 'src/backend/executor')
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